|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||Twinning Kinetics and Its Sensitivity to the Strain Rate
||Kavan Hazeli, Owen Kingstedt, Vignesh Kannan, Guruswami Ravichandran, KT Ramesh
|On-Site Speaker (Planned)
This study uses in situ techniques to investigate the effect of strain-rate on the two important aspects of deformation twinning: twin variant selection and twin kinetics. Magnesium (Mg) was selected as a model material to study because its hexagonal close packed structure is closest perfect packing of spheres. Herein the first in situ experimental evidence on the sensitivity of extension twin variant selection to the strain rate in Mg single crystal is presented. It was observed that at the same level of total strain, dynamically compressed specimens contained four extension twin variants and double extension twins while quasi-statically compressed specimens contained only two twin variants. At high strain rate loading twin variant selection was observed to be inconsistent with Schmid-type behavior. This study also investigates the twinning kinetics (growth and thickening) at higher strain rate regime providing the first measurements of twin propagation velocity of first and second-generation twins.
||Planned: Supplemental Proceedings volume